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Quantitative ultrastructural changes induced by glucose in pancreatic B cells.
Acta Physiologica Et Pharmacologica Latinoamericana : Organo De La Asociacion Latinoamericana De Ciencias Fisiologicas Y De La Asociacion Latinoamericana De Farmacologia
|January 1, 1986
Summary
High glucose levels significantly alter pancreatic B cell structure, increasing organelle volume and affecting insulin granule size and distribution. These ultrastructural changes correlate with glucose-induced metabolic effects in B cells.
Area of Science:
- Endocrinology
- Cell Biology
- Metabolic Research
Background:
- Pancreatic B cells are central to glucose homeostasis and insulin secretion.
- Glucose metabolism profoundly influences B cell function and morphology.
Purpose of the Study:
- To investigate the acute ultrastructural changes in pancreatic B cells exposed to varying glucose concentrations.
- To correlate observed morphological alterations with known glucose-induced metabolic effects.
Main Methods:
- Normal rat pancreas perfused with specific glucose concentrations (3.3 and 16.6 mmol/l).
- Ultrastructural analysis of pancreatic B cells using electron microscopy.
- Quantitative assessment of organelle volumes and granule characteristics.
Main Results:
- 16.6 mmol/l glucose significantly increased the volume of rough endoplasmic reticulum (RER), microtubules, mitochondria, lysosomes, and B granules.
- No significant changes were observed in total B cell volume, nucleus, cytoplasm, or Golgi complex size.
- Insulin secretory granules showed reduced numbers but increased diameter, with more pale granules and those attached to the cell membrane.
Conclusions:
- Elevated extracellular glucose induces significant ultrastructural changes in pancreatic B cell organelles beyond classical insulin secretion.
- These morphological adaptations in B cells are consistent with glucose's impact on cellular metabolism.
- The study provides a deeper understanding of the intricate relationship between glucose levels and pancreatic B cell structure-function dynamics.